Abstract
A new microstructural evolution formulation is developed to relate the evolution of precipitate size to its relative volume fraction for concurrent precipitate nucleation and growth processes in AA7xxx alloys. By combining the new microstructural relationship with a previously developed yield strength model, a new formulation is also developed to predict precipitation hardening due to weak shearable precipitates as a function of only a single variable. A combination of small angle x-ray scattering, isothermal calorimetry and microhardness measurements, as well as experimental data from the literature are used to evaluate and validate the new modeling relationships. The results enable highly reliable predictions for the microstructure and yield strength evolution during underaging in AA7xxx.
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